User blog comment:KanameTousen/Nelo Angelo/@comment-1350755-20120408213808

Not sure. I would've thought that if demons "died", they simply return to the Abyss. Please correct me if I'm wrong, as I might be thinking of the Megami Tensei universe (I heard a demon conversation with one player and a Samael who said something like it).

If you want to see that conversation, here's a link: http://lparchive.org/Shin-Megami-Tensei-1/Update%2057/

It's a long way down, but keep looking until you find the player character conversing with Samael. I found it quite interesting.